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#include"../include/types.h"
#include"../include/asm.h"
#include"../include/stdio.h"
#define BUFFER_SIZE 200
char buffer[BUFFER_SIZE];
size_t buffer_index=0;
#define PIC1_COMMAND_PORT 0x20
#define PIC1_DATA_PORT 0x21
#define PIC2_COMMAND_PORT 0xA0
#define PIC2_DATA_PORT 0xA1
// IO Ports for Keyboard
#define KEYBOARD_DATA_PORT 0x60
#define KEYBOARD_STATUS_PORT 0x64
void previous_field(void);
void terminal_putchar(char c);
void tty(char *buffer);
void prompt(void);
void clear();
void us_en(char keymap[]);
char charcode[256];
bool ispressed[128];
void init_keyboard()
{
// 0xFD = 1111 1101 in binary. enables only IRQ1
// Why IRQ1? Remember, IRQ0 exists, it's 0-based
ioport_out(PIC1_DATA_PORT, 0xFD);
us_en(charcode);
}
void backspace()
{
if(buffer_index<=0) return;
previous_field();
printf(" ");
previous_field();
buffer[--buffer_index]='\0';
return;
}
void enter()
{
printf("\n");
if(buffer_index>0)
{
tty(buffer);
for(int i=0;i<BUFFER_SIZE;i++) buffer[i]='\0';
buffer_index=0;
}
prompt();
return;
}
void space()
{
buffer[buffer_index++]=' ';
printf(" ");
}
#define lshift ispressed[0x2A]
#define lctrl ispressed[0x1D]
void handle_keyboard_interrupt()
{
ioport_out(PIC1_COMMAND_PORT, 0x20);
uint8_t status = ioport_in(KEYBOARD_STATUS_PORT);
if (status & 0x1)
{
uint8_t keycode = ioport_in(KEYBOARD_DATA_PORT);
if(keycode<0x80)
{
ispressed[keycode]=1;
if(keycode==0x0E) backspace();
else if(keycode==0x1C) enter();
else if(keycode==0x39) space();
else
{
char c=charcode[keycode];
if(c!=' ')
{
if(lshift)
{
if(c>='a'&&c<='z') c-=32;
}
if(lctrl)
{
if(c=='l')
{
clear();
prompt();
return;
}
}
buffer[buffer_index++]=c;
printf("%c",c);
}
}
}
else
{
ispressed[keycode-0x80]=0;
}
}
}
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